Revolving screen



E. J. POPE.

REVOLVING SCREEN.

APPLICATION FILED JULY 24.1919.

Patented Dec. 6, 1921,

4 z a 1 f cummm.

nnw'nnn J. runs, or car. cos-urn, rarer-linen, assrunon'ro M'UlbLEN a no coivrranr, a conroaarron or iuronrean.

RIE'VULVENG SCREEN.

. To alien/1.0m it may concern.

Be it known that 1, Beware lose, a c tizen oi the United tates, residing at Joseph, in the county otlderrien and State otldichigan, have invented. certain new and useful Improvements in Revolving Screens and do hereby declare tlieqfollowing to be I a :lull, clear, and exact description oi? the invention, such as will enable others skilled in the art to which it appertains to make and use the same. 1 i

. This invention rel ates to certain improve ments in screens, particularly of the type :t'or treatingpulp. r a

I The inventlonhae lor object to prof ride for eli'ectin g'ithe screening or sitting oi? the pulp as it is talren up or elevated within a vat upon a rotatable slotted or perforated cylinder or screen, the pulp being at the same time subjected to an alternate suction and pressure action --tor etlecting the elevate inp, of the. pulp upon therotatable cylinder, thus providinrgnot only dor the cleaning. of

. the pulp, but also against the clogging" or choking of the screen openings or slots, a perfect clearance action belng thereby provided for the ready. outward and inward passage of the otherwisedetained portion of.

the pulp through said slots or openings.

A; further object of the invention is to carry out the aforesaid ends in an effective, simple and ineirpensive manner; whilestill furtherobjects thereof will. he. made apparent from the following description or dis- OlOSllI'BOili the invention lhe invention. theretore consists octzcertain instrunientalitics and features of condisclosed and struction substantially as hereinafter fully defined by the appended claims. 4 i

In the accompanying drawings is illustrated; the preferred embodiment of my in vention, wherein. it will beunderstood that various changes and modifications as to the detailed construction and arrangement of Specification of Letters Patent.

Application filed .1 uly at,

the same.

Patented lace. b infill. isle. Serial no; 313,070.

suitable vat or receptacle 1, superposed or mounted upon a frame or supportn which may be constructed in any Way most c011- venicnt and adapted to conserve theends in view.

The vat or receptacle 1, into which the pulp is fed from an auiriliary receptacle or feed boreil, also securedupon thesupport A, has rotatably mounted therein a screening cylinder 3, upon a centrallongitudinal shaft 4 carrying or fixed to said screening cylinder and journaled upon suitable bearings 5, secured to. said support. The vat or receptacle .1 has an end outlet compartment 1 for the discharge of the pulp, passing out through an end of the screen, which has been screened and cleaned.

A partition member 6, secured within the vat to the sides. and bottom thereof, ex-

tends upwardly about the center of the cylinder and conforms to the periphery or cir- GHIDIEGIGDCGO'E the screening cylinder 3, and subdivides the vat into compartments 7.

The screening cylinder has its periphery covered withplates 8 suitably applied and secured. thereto and entirely encompassing Said plates are each provided with numerous closely disposed elongated perforations .or slots 9, extending preferably in lines parallel. with the axis of the cylin der, whereby they are adapted to allowmore readily :Eorthe passage of the. pulp as the cylinder is revolved, as is believed clearly apparent. These slots or perforations are also preferably arranged in symmetrical groups, the individualslots or perforations thereof alining each other as shown, thereby having the tendency to also obviate a clogging or congestion action of the pulp.

A piston cylinder 10 is arranged in conncction with tl16xVELt,6ii7l18I vertically or horizontally, at. the side or under the vat, and is provided with a piston 11 whose actuating rod 11 is suitably packed in the usualg nanner, asat 11 at one end oil' the cylinder, and is adapted to be actuated for imparting a reciprocating movement to the piston, preferably by means of a connecting rod or pitman 12 suitably coupled to said piston-rod and to a cross-head 13, in turn connected to. a crank shaft 14 suitably actuated by a pulley 15, the latter being driven by a motor-driven belt, (not shown) or otherwise. The crank shaft 14- is supported in a suitable bearing 15 suitably supported belted to and crank-shaft 14;.

upon the frame A or otherwise. The piston cylinder 10 is provided in its upper surface with two passages or ports 16, and around said ports are provided upwardly flared flanges lo forming hopper resembling mouths therefor, for extending the suction or pressure area, as will presently more fully appear. These ports or passages are positioned in vertical alinem'ent'with openings or passages l 1', in the vat bottom, so as to provide for producing within the coinpartments 7 of the vat an alternate suction and pressure therethrough when the piston 11 is actuated. I

The screening-cylinder shaft 4 1s preferably driven by means of a worm wheel 17 Se cured thereon, said. worm wheel being preferably inmesh'with and rotated by a worm 18' supported upon brackets 19 secured to the frameA, said wormbeing in practice driven by pulley 15 on In operation, the pulp preliminarily placed or delivered into the auxillary re- .gceptaeleor box 2, is in turn fed into the vat l .insuitable'quantities, which pulp is subjected to an alternate suction and pressure action by means of piston. 11, which action raises the pulp in the vat and forces apart of the pulp through the slots or perforations in the sceen plates 8; As .the pulp is low- "eredin the vatnont-he return stroke of the piston 11, itdraws back the pulp which has partly'passed through the slots'in the plates '8, thus preventing the slots from becoming clogged. The cleaned portion of thepulp is passed out of the open end of the cylinder 3 and goes to the paper making machine. As above indicated, it will be observed that during the suction action of the piston a perfect clearance is provided through the pulpscreening slots or openings of the cylinder or screen, thus providing,- as stated, against the clogging or choking action. The uncleaned pulpor residue passesout through passages in the bottom of the vat for further treating means cooperative with said rotatable screen, and means subdividing said vat exteriorly of said screen, whereby the material in said vat is alternately forced upwardly and drawn downwardly through the slots in the screen plates of said screen.

2. A screen or sifter, including a vat having an outlet at one end, a rotatable screen positioned in said vat and having a numerously sloted or perforated perimeter, a common pressure-exerting and suetion-generat ing means cooperative with said rotatable screen and comprising a reciprocating piston working in a cylinder in communication with said vat, and means subdividing said vat eXteriorly of, and at a point intermediate of the ends of said cylinder.

3. A screen or sifter, including a vat having an outlet at one end, a rotatable screen positioned in said vat and having a numerously slotted or perforated perimeter, a common pressure-exerting and suction-generating means cooperative with said rotatable screen and comprising a reciprocating piston working in a cylinder in communicating with sald vat, means subdividing said vat :exteriorly of, and at a point intermediate of the ends of said rotatable screen, means for actuating said screen, and means for actu ating said piston.

4. A screen or sifter, including a vat having a plurality of compartments and an out let at one end, a screen arranged to rotate within said compartments and having its perimetrical surface provided with a plurality of elongated slots, with their axes extending in lines parallel with the axis of the screen, and means for forcing material upwardly and downwardly alternately in the compartments of said vat and through said slots.

5. A screen or sifter, including a vat having a plurality of compartments and an outlet at one end, a screen arranged to rotate within said compartments, and having its perimetrical surface formed of plates each provided with a plurality of slots arranged in groups, the individual slots of each group being in alinement with each other, and means for forcing material upwardly and downwardly alternately in the compartments of said vat and through said slots.

In testimony whereof, I afiix my sign-.1-

ture.

EDWARD J. POPE. 

